Heat transfer and pressure drop characteristics of inclined elliptical fin tube heat exchanger of varying ellipticity ratio using CFD code
Heat transfer and pressure drop characteristics of inclined elliptical fin tube heat exchanger of varying ellipticity ratio using CFD code
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DOI：
10.1016/j.ijheatmasstransfer.2017.11.094
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发表时间：
2018-04
影响因子：
5.2
通讯作者：
Siddhant Singh Yogesh;A. Selvaraj;D. Ravi;T. Rajagopal
中科院分区：
文献类型：
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作者：
Siddhant Singh Yogesh;A. Selvaraj;D. Ravi;T. Rajagopal
采用三维计算流体动力学（CFD）方法，研究了不同椭圆率、不同管向的椭圆管翅片管换热器的摩擦和传热特性。在过渡区的空气被认为是在本研究中的工作流体。通过将模拟结果与Bhuiyan等人（2013）获得的数值结果进行比较，对ANSYS Fluent 15.0的预测结果进行了数值验证。入口处的雷诺数在1300-1600之间变化，湍流封闭采用标准k-ω湍流模型。用于分析的管的椭圆度比范围在0.6和0.8之间，并且分析了这些管的旋转对科尔本因子、摩擦因子和效率指数的影响。科尔本系数在初始阶段增加并达到峰值，之后随着管道倾斜度的增加而降低。椭圆率和Colcolold数的增加降低了科尔本因子。摩擦因数与管道倾角和椭圆率成正比，随管壁厚度的增加而减小。对所有模型的效率指数参数进行了评价。
A three-dimensional computational fluid dynamics (CFD) investigation of the friction and heat transfer characteristics of a fin tube heat exchanger having elliptical tubes of various ellipticity ratio and orientation of these tubes to the horizontal are analysed in this study. Air in the transitional regime is considered as the working fluid in this present study. Numerical validation of the predicted results by ANSYS Fluent 15.0 is carried out by comparing the simulated results with the numerical results a obtained by Bhuiyan et al. (2013). Reynold’s number at inlet is varied in the range of 1300–1600 and Standard k-ω turbulence model is used for turbulent closure. The ellipticity ratio of the tubes utilized for the analysis ranges between 0.6 and 0.8 and the effect of rotation of these tubes on Colburn factor, friction factor and efficiency index has been analysed. The Colburn factor increased initially reaching a peak, after which it gets lowered with increase in tube inclination. Increase in ellipticity and Reynold’s number decreased the Colburn factor. Friction factor varies in direct proportion to tube inclination and ellipticity ratio, whereas it decreases with the increase in Reynold’s number. The efficiency index parameter for all the models has been evaluated.